Test 1&3 PoE

What appears to be the strongest influence on a perosn’s percentage of type 1 vs type 2 muscle fibers?

Genetics

Which fiber type is used most extensively during long-duration, low-intensity aerobic activity?

Type 1

Which protein shields the myosin-binding site, preventing contraction from happening at rest?

Tropmyosin

Which region of the nerve integrates all incoming EPSPs and IPSPs?

Axon Hillock

What are the alternating light and dark regions seen in skeletal muscle called?

Striations

Muscle fascicle curvatures increase with greater muscle______.

Diameter

Which fiber type generally has the greatest power-producing capacity?

Type 2x

Which description best fits type 1 motor units?

Type 2 Fibers

During a very heavy lifting task, which recruitment pattern follows the size principle?

Chemicals that carry signals from one cell to another across a synapse are called

neurotransmitters

Which ion binds to titin, thereby changing muscle stiffness?

Ca2+

The threshold membrane potential for many neurons is approximately

-55 to -50 mV

The decision to voluntarily move your arm comes from which part of the brain?

Primary Motor Cortex

Which of these statements is true about leg muscle fibers from Olympic sprinter versus an Olympic marathon runner?

At rest, how does the inside of a neuron compare electrically with the outside?

Which type of training, high intensity interval (HIIT) or endurance (END), increases motor unit discharge rate?

When attempting to lift a very heavy box, which strategy is safest and most consistent with muscle force velocity principles?

Why are neurons described as excitable tissue?

Which sequence best describes excitation-contraction coupling from motor neuron to muscle relaxation?

What effect does an excitatory postsynaptic potential usually have on postsynaptic membrane?

It depolarizes the membrane

The fastest impulses travel on axons that are

myelinated and large

Which region of the sarcomere appears dark because thick and thin filaments overlap

A-Band

A small localized change in neuron’s membrane potential is called a

graded potential

Nervous System structures that detect a stimulus are called

receptors

Which statement best distinguishes resting membrane potential, graded potentials, and action potentials?

resting potential is the baseline voltage; graded potentials vary in size; action potentials are all-or-none propagated signals.

Which sequence correctly describes the major organization of peripheral motor control?

If the net effect of all graded potentials is hyperpolarization, what will occur?

Nothing will occur

Which structures carry action potentials deep into the muscle fiber?

T-tubules

Which statement about a motor unit is correct?

The muscle fibers within a single motor unit are generally the same fiber type.